In this activity, students learn about the aviation hazard associated with volcanic eruptions as they take the role of an air traffic controller and calculate the amount of time it will take for an ash plume to travel to the control tower. A map of...(View More) the continental U.S. is included. The resource is part of the teacher's guide accompanying the video, NASA Why Files: The Case of the Mysterious Red Light. Lesson objectives supported by the video, additional resources, teaching tips and an answer sheet are included in the teacher's guide.(View Less)